Trump, Clinton locked in tight race in Arizona
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Presumptive Republican nominee Donald TrumpDonald John TrumpBusiness school deans call for lifting country-specific visa caps Bolton told ex-Trump aide to call White House lawyers about Ukraine pressure campaign: report Federal prosecutors in New York examining Giuliani business dealings with Ukraine: report MORE and Democratic front-runner Hillary ClintonHillary Diane Rodham ClintonSaagar Enjeti: Tuesday's Democratic debate already 'rigged' against Gabbard, Sanders Ilhan Omar raises .1 million in third quarter Bloomberg rethinking running for president: report MORE are running close in Arizona, with Trump holding a slight lead, according to a new Public Policy Polling survey.

Trump has a slight lead over Clinton in the state, 40 to 38 percent. In the poll, Libertarian Party presidential candidate Gary Johnson gets 6 percent of the vote and Green Party candidate Jill Stein takes 2 percent.

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Among Democrats, Clinton has 80 percent of the vote. But among Republicans, Trump takes only gets 68 percent of the vote.

Only 65 percent of Republican respondents say they are comfortable with Trump being their party's nominee, while 22 percent say they aren't.

In a head-to-head matchup between Trump and Clinton, Trump has a slightly larger lead over the Democratic front-runner, 45 to 41 percent. He also garners 77 percent support among Republicans in a head-to-head matchup.

In a Trump vs. Clinton race, 15 percent of Republicans said they are undecided, compared to 8 percent of Democrats.

Democratic candidate Bernie SandersBernie SandersSupport drops for Medicare for All but increases for public option Hillicon Valley: Warren takes on Facebook over political ads | Zuckerberg defends meetings with conservatives | Civil liberties groups sound alarm over online extremism bill On The Money: Trump touts China trade deal | Wall Street, Washington see signs for caution | Trump threatens sanctions on Turkey | Sanders proposes sharp hike to corporate taxes MORE has a small lead over Trump in the state, 42 to 39 percent. Johnson gets 6 percent of the vote and Stein has 2 percent, according to the poll.

In a head-to-head matchup between Sanders and Trump, the Vermont senator has a 1-point advantage over Trump, 45 to 44 percent.

Among voters under 45, Clinton leads Trump 39 to 32 percent. But Sanders holds a larger advantage over the presumptive GOP nominee among younger voters, leading Trump 52 to 29 percent.

The poll surveyed 896 registered voters from May 13-15. The margin of error is 3.3 percent.